/*****************************************************************************
 * ppp.c - Network Point to Point Protocol program file.
 *
 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
 * portions Copyright (c) 1997 by Global Election Systems Inc.
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice and the following disclaimer are included verbatim in any
 * distributions. No written agreement, license, or royalty fee is required
 * for any of the authorized uses.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************
 * REVISION HISTORY
 *
 * 03-01-01 Marc Boucher <marc@mbsi.ca>
 *   Ported to lwIP.
 * 97-11-05 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
 *   Original.
 *****************************************************************************/

/*
 * ppp_defs.h - PPP definitions.
 *
 * if_pppvar.h - private structures and declarations for PPP.
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 */

/*
 * if_ppp.h - Point-to-Point Protocol definitions.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "ppp_impl.h"
#include "lwip/ip.h" /* for ip_input() */

#include "pppdebug.h"

#include "randm.h"
#include "fsm.h"
#if PAP_SUPPORT
#include "pap.h"
#endif /* PAP_SUPPORT */
#if CHAP_SUPPORT
#include "chap.h"
#endif /* CHAP_SUPPORT */
#include "ipcp.h"
#include "lcp.h"
#include "magic.h"
#include "auth.h"
#if VJ_SUPPORT
#include "vj.h"
#endif /* VJ_SUPPORT */
#if PPPOE_SUPPORT
#include "netif/ppp_oe.h"
#endif /* PPPOE_SUPPORT */

#include "lwip/tcpip.h"
#include "lwip/api.h"
#include "lwip/snmp.h"

#include <string.h>

/*************************/
/*** LOCAL DEFINITIONS ***/
/*************************/

/** PPP_INPROC_MULTITHREADED==1 call pppInput using tcpip_callback().
 * Set this to 0 if pppInProc is called inside tcpip_thread or with NO_SYS==1.
 * Default is 1 for NO_SYS==0 (multithreaded) and 0 for NO_SYS==1 (single-threaded).
 */
#ifndef PPP_INPROC_MULTITHREADED
#define PPP_INPROC_MULTITHREADED (NO_SYS == 0)
#endif

/** PPP_INPROC_OWNTHREAD==1: start a dedicated RX thread per PPP session.
 * Default is 0: call pppos_input() for received raw characters, charcater
 * reception is up to the port */
#ifndef PPP_INPROC_OWNTHREAD
#define PPP_INPROC_OWNTHREAD PPP_INPROC_MULTITHREADED
#endif

#if PPP_INPROC_OWNTHREAD && !PPP_INPROC_MULTITHREADED
#error "PPP_INPROC_OWNTHREAD needs PPP_INPROC_MULTITHREADED==1"
#endif

/*
 * The basic PPP frame.
 */
#define PPP_ADDRESS(p) (((u_char *)(p))[0])
#define PPP_CONTROL(p) (((u_char *)(p))[1])
#define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])

/* PPP packet parser states.  Current state indicates operation yet to be
 * completed. */
typedef enum {
	PDIDLE = 0,  /* Idle state - waiting. */
	PDSTART,     /* Process start flag. */
	PDADDRESS,   /* Process address field. */
	PDCONTROL,   /* Process control field. */
	PDPROTOCOL1, /* Process protocol field 1. */
	PDPROTOCOL2, /* Process protocol field 2. */
	PDDATA       /* Process data byte. */
} PPPDevStates;

#define ESCAPE_P(accm, c) ((accm)[(c) >> 3] & pppACCMMask[c & 0x07])

/************************/
/*** LOCAL DATA TYPES ***/
/************************/

/** RX buffer size: this may be configured smaller! */
#ifndef PPPOS_RX_BUFSIZE
#define PPPOS_RX_BUFSIZE (PPP_MRU + PPP_HDRLEN)
#endif

typedef struct PPPControlRx_s {
	/** unit number / ppp descriptor */
	int pd;
	/** the rx file descriptor */
	sio_fd_t fd;
	/** receive buffer - encoded data is stored here */
#if PPP_INPROC_OWNTHREAD
	u_char rxbuf[PPPOS_RX_BUFSIZE];
#endif /* PPP_INPROC_OWNTHREAD */

	/* The input packet. */
	struct pbuf *inHead, *inTail;

#if PPPOS_SUPPORT
	u16_t inProtocol;       /* The input protocol code. */
	u16_t inFCS;            /* Input Frame Check Sequence value. */
#endif                      /* PPPOS_SUPPORT */
	PPPDevStates inState;   /* The input process state. */
	char         inEscaped; /* Escape next character. */
	ext_accm     inACCM;    /* Async-Ctl-Char-Map for input. */
} PPPControlRx;

/*
 * PPP interface control block.
 */
typedef struct PPPControl_s {
	PPPControlRx rx;
	char         openFlag; /* True when in use. */
#if PPPOE_SUPPORT
	struct netif *      ethif;
	struct pppoe_softc *pppoe_sc;
#endif           /* PPPOE_SUPPORT */
	int if_up;   /* True when the interface is up. */
	int errCode; /* Code indicating why interface is down. */
#if PPPOS_SUPPORT
	sio_fd_t fd;       /* File device ID of port. */
#endif                 /* PPPOS_SUPPORT */
	u16_t    mtu;      /* Peer's mru */
	int      pcomp;    /* Does peer accept protocol compression? */
	int      accomp;   /* Does peer accept addr/ctl compression? */
	u_long   lastXMit; /* Time of last transmission. */
	ext_accm outACCM;  /* Async-Ctl-Char-Map for output. */
#if PPPOS_SUPPORT && VJ_SUPPORT
	int               vjEnabled; /* Flag indicating VJ compression enabled. */
	struct vjcompress vjComp;    /* Van Jacobson compression header. */
#endif                           /* PPPOS_SUPPORT && VJ_SUPPORT */

	struct netif netif;

	struct ppp_addrs addrs;

	void (*linkStatusCB)(void *ctx, int errCode, void *arg);
	void *linkStatusCtx;

} PPPControl;

/*
 * Ioctl definitions.
 */

struct npioctl {
	int         protocol; /* PPP procotol, e.g. PPP_IP */
	enum NPmode mode;
};

/***********************************/
/*** LOCAL FUNCTION DECLARATIONS ***/
/***********************************/
#if PPPOS_SUPPORT
#if PPP_INPROC_OWNTHREAD
static void pppInputThread(void *arg);
#endif /* PPP_INPROC_OWNTHREAD */
static void pppDrop(PPPControlRx *pcrx);
static void pppInProc(PPPControlRx *pcrx, u_char *s, int l);
static void pppFreeCurrentInputPacket(PPPControlRx *pcrx);
#endif /* PPPOS_SUPPORT */

/******************************/
/*** PUBLIC DATA STRUCTURES ***/
/******************************/
u_long subnetMask;

static PPPControl pppControl[NUM_PPP]; /* The PPP interface control blocks. */

/*
 * PPP Data Link Layer "protocol" table.
 * One entry per supported protocol.
 * The last entry must be NULL.
 */
struct protent *ppp_protocols[] = {&lcp_protent,
#if PAP_SUPPORT
                                   &pap_protent,
#endif /* PAP_SUPPORT */
#if CHAP_SUPPORT
                                   &chap_protent,
#endif /* CHAP_SUPPORT */
#if CBCP_SUPPORT
                                   &cbcp_protent,
#endif /* CBCP_SUPPORT */
                                   &ipcp_protent,
#if CCP_SUPPORT
                                   &ccp_protent,
#endif /* CCP_SUPPORT */
                                   NULL};

/*
 * Buffers for outgoing packets.  This must be accessed only from the appropriate
 * PPP task so that it doesn't need to be protected to avoid collisions.
 */
u_char outpacket_buf[NUM_PPP][PPP_MRU + PPP_HDRLEN];

/*****************************/
/*** LOCAL DATA STRUCTURES ***/
/*****************************/

#if PPPOS_SUPPORT
/*
 * FCS lookup table as calculated by genfcstab.
 * @todo: smaller, slower implementation for lower memory footprint?
 */
static const u_short fcstab[256]
    = {0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5,
       0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52,
       0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3,
       0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
       0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9,
       0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e,
       0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f,
       0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
       0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862,
       0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb,
       0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948,
       0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
       0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226,
       0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497,
       0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704,
       0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
       0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb,
       0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c,
       0x3de3, 0x2c6a, 0x1ef1, 0x0f78};

/* PPP's Asynchronous-Control-Character-Map.  The mask array is used
 * to select the specific bit for a character. */
static u_char pppACCMMask[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};

#if PPP_INPROC_OWNTHREAD
/** Wake up the task blocked in reading from serial line (if any) */
static void pppRecvWakeup(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppRecvWakeup: unit %d\n", pd));
	if (pppControl[pd].openFlag != 0) {
		sio_read_abort(pppControl[pd].fd);
	}
}
#endif /* PPP_INPROC_OWNTHREAD */
#endif /* PPPOS_SUPPORT */

void pppLinkTerminated(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppLinkTerminated: unit %d\n", pd));

#if PPPOE_SUPPORT
	if (pppControl[pd].ethif) {
		pppoe_disconnect(pppControl[pd].pppoe_sc);
	} else
#endif /* PPPOE_SUPPORT */
	{
#if PPPOS_SUPPORT
		PPPControl *pc;
#if PPP_INPROC_OWNTHREAD
		pppRecvWakeup(pd);
#endif /* PPP_INPROC_OWNTHREAD */
		pc = &pppControl[pd];

		PPPDEBUG(LOG_DEBUG,
		         ("pppLinkTerminated: unit %d: linkStatusCB=%p errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
		if (pc->linkStatusCB) {
			pc->linkStatusCB(pc->linkStatusCtx, pc->errCode ? pc->errCode : PPPERR_PROTOCOL, NULL);
		}

		pc->openFlag = 0; /**/
#endif                    /* PPPOS_SUPPORT */
	}
	PPPDEBUG(LOG_DEBUG, ("pppLinkTerminated: finished.\n"));
}

void pppLinkDown(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppLinkDown: unit %d\n", pd));

#if PPPOE_SUPPORT
	if (pppControl[pd].ethif) {
		pppoe_disconnect(pppControl[pd].pppoe_sc);
	} else
#endif /* PPPOE_SUPPORT */
	{
#if PPPOS_SUPPORT && PPP_INPROC_OWNTHREAD
		pppRecvWakeup(pd);
#endif /* PPPOS_SUPPORT && PPP_INPROC_OWNTHREAD*/
	}
}

/** Initiate LCP open request */
static void pppStart(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppStart: unit %d\n", pd));
	lcp_lowerup(pd);
	lcp_open(pd); /* Start protocol */
	PPPDEBUG(LOG_DEBUG, ("pppStart: finished\n"));
}

/** LCP close request */
static void pppStop(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppStop: unit %d\n", pd));
	lcp_close(pd, "User request");
}

/** Called when carrier/link is lost */
static void pppHup(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppHupCB: unit %d\n", pd));
	lcp_lowerdown(pd);
	link_terminated(pd);
}

/***********************************/
/*** PUBLIC FUNCTION DEFINITIONS ***/
/***********************************/
/* Initialize the PPP subsystem. */

struct ppp_settings ppp_settings;

void pppInit(void)
{
	struct protent *protp;
	int             i, j;

	memset(&ppp_settings, 0, sizeof(ppp_settings));
	ppp_settings.usepeerdns = 1;
	pppSetAuth(PPPAUTHTYPE_NONE, NULL, NULL);

	magicInit();

	subnetMask = PP_HTONL(0xffffff00UL);

	for (i = 0; i < NUM_PPP; i++) {
		/* Initialize each protocol to the standard option set. */
		for (j = 0; (protp = ppp_protocols[j]) != NULL; ++j) {
			(*protp->init)(i);
		}
	}
}

void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd)
{
	switch (authType) {
	case PPPAUTHTYPE_NONE:
	default:
#ifdef LWIP_PPP_STRICT_PAP_REJECT
		ppp_settings.refuse_pap = 1;
#else  /* LWIP_PPP_STRICT_PAP_REJECT */
		/* some providers request pap and accept an empty login/pw */
		ppp_settings.refuse_pap = 0;
#endif /* LWIP_PPP_STRICT_PAP_REJECT */
		ppp_settings.refuse_chap = 1;
		break;

	case PPPAUTHTYPE_ANY:
		/* Warning: Using PPPAUTHTYPE_ANY might have security consequences.
		 * RFC 1994 says:
		 *
		 * In practice, within or associated with each PPP server, there is a
		 * database which associates "user" names with authentication
		 * information ("secrets").  It is not anticipated that a particular
		 * named user would be authenticated by multiple methods.  This would
		 * make the user vulnerable to attacks which negotiate the least secure
		 * method from among a set (such as PAP rather than CHAP).  If the same
		 * secret was used, PAP would reveal the secret to be used later with
		 * CHAP.
		 *
		 * Instead, for each user name there should be an indication of exactly
		 * one method used to authenticate that user name.  If a user needs to
		 * make use of different authentication methods under different
		 * circumstances, then distinct user names SHOULD be employed, each of
		 * which identifies exactly one authentication method.
		 *
		 */
		ppp_settings.refuse_pap  = 0;
		ppp_settings.refuse_chap = 0;
		break;

	case PPPAUTHTYPE_PAP:
		ppp_settings.refuse_pap  = 0;
		ppp_settings.refuse_chap = 1;
		break;

	case PPPAUTHTYPE_CHAP:
		ppp_settings.refuse_pap  = 1;
		ppp_settings.refuse_chap = 0;
		break;
	}

	if (user) {
		strncpy(ppp_settings.user, user, sizeof(ppp_settings.user) - 1);
		ppp_settings.user[sizeof(ppp_settings.user) - 1] = '\0';
	} else {
		ppp_settings.user[0] = '\0';
	}

	if (passwd) {
		strncpy(ppp_settings.passwd, passwd, sizeof(ppp_settings.passwd) - 1);
		ppp_settings.passwd[sizeof(ppp_settings.passwd) - 1] = '\0';
	} else {
		ppp_settings.passwd[0] = '\0';
	}
}

#if PPPOS_SUPPORT
/** Open a new PPP connection using the given I/O device.
 * This initializes the PPP control block but does not
 * attempt to negotiate the LCP session.  If this port
 * connects to a modem, the modem connection must be
 * established before calling this.
 * Return a new PPP connection descriptor on success or
 * an error code (negative) on failure.
 *
 * pppOpen() is directly defined to this function.
 */
int pppOverSerialOpen(sio_fd_t fd, pppLinkStatusCB_fn linkStatusCB, void *linkStatusCtx)
{
	PPPControl *pc;
	int         pd;

	if (linkStatusCB == NULL) {
		/* PPP is single-threaded: without a callback,
		 * there is no way to know when the link is up. */
		return PPPERR_PARAM;
	}

	/* Find a free PPP session descriptor. */
	for (pd = 0; pd < NUM_PPP && pppControl[pd].openFlag != 0; pd++)
		;

	if (pd >= NUM_PPP) {
		pd = PPPERR_OPEN;
	} else {
		pc = &pppControl[pd];
		/* input pbuf left over from last session? */
		pppFreeCurrentInputPacket(&pc->rx);
		/* @todo: is this correct or do I overwrite something? */
		memset(pc, 0, sizeof(PPPControl));
		pc->rx.pd = pd;
		pc->rx.fd = fd;

		pc->openFlag = 1;
		pc->fd       = fd;

#if VJ_SUPPORT
		vj_compress_init(&pc->vjComp);
#endif /* VJ_SUPPORT */

		/*
		 * Default the in and out accm so that escape and flag characters
		 * are always escaped.
		 */
		pc->rx.inACCM[15] = 0x60; /* no need to protect since RX is not running */
		pc->outACCM[15]   = 0x60;

		pc->linkStatusCB  = linkStatusCB;
		pc->linkStatusCtx = linkStatusCtx;

		/*
		 * Start the connection and handle incoming events (packet or timeout).
		 */
		PPPDEBUG(LOG_INFO, ("pppOverSerialOpen: unit %d: Connecting\n", pd));
		pppStart(pd);
#if PPP_INPROC_OWNTHREAD
		sys_thread_new(PPP_THREAD_NAME, pppInputThread, (void *)&pc->rx, PPP_THREAD_STACKSIZE, PPP_THREAD_PRIO);
#endif /* PPP_INPROC_OWNTHREAD */
	}

	return pd;
}
#endif /* PPPOS_SUPPORT */

#if PPPOE_SUPPORT
static void pppOverEthernetLinkStatusCB(int pd, int up);

void pppOverEthernetClose(int pd)
{
	PPPControl *pc = &pppControl[pd];

	/* *TJL* There's no lcp_deinit */
	lcp_close(pd, NULL);

	pppoe_destroy(&pc->netif);
}

int pppOverEthernetOpen(struct netif *ethif, const char *service_name, const char *concentrator_name,
                        pppLinkStatusCB_fn linkStatusCB, void *linkStatusCtx)
{
	PPPControl *pc;
	int         pd;

	LWIP_UNUSED_ARG(service_name);
	LWIP_UNUSED_ARG(concentrator_name);

	if (linkStatusCB == NULL) {
		/* PPP is single-threaded: without a callback,
		 * there is no way to know when the link is up. */
		return PPPERR_PARAM;
	}

	/* Find a free PPP session descriptor. Critical region? */
	for (pd = 0; pd < NUM_PPP && pppControl[pd].openFlag != 0; pd++)
		;
	if (pd >= NUM_PPP) {
		pd = PPPERR_OPEN;
	} else {
		pc = &pppControl[pd];
		memset(pc, 0, sizeof(PPPControl));
		pc->openFlag = 1;
		pc->ethif    = ethif;

		pc->linkStatusCB  = linkStatusCB;
		pc->linkStatusCtx = linkStatusCtx;

		lcp_wantoptions[pd].mru               = PPPOE_MAXMTU;
		lcp_wantoptions[pd].neg_asyncmap      = 0;
		lcp_wantoptions[pd].neg_pcompression  = 0;
		lcp_wantoptions[pd].neg_accompression = 0;

		lcp_allowoptions[pd].mru               = PPPOE_MAXMTU;
		lcp_allowoptions[pd].neg_asyncmap      = 0;
		lcp_allowoptions[pd].neg_pcompression  = 0;
		lcp_allowoptions[pd].neg_accompression = 0;

		if (pppoe_create(ethif, pd, pppOverEthernetLinkStatusCB, &pc->pppoe_sc) != ERR_OK) {
			pc->openFlag = 0;
			return PPPERR_OPEN;
		}

		pppoe_connect(pc->pppoe_sc);
	}

	return pd;
}
#endif /* PPPOE_SUPPORT */

/* Close a PPP connection and release the descriptor.
 * Any outstanding packets in the queues are dropped.
 * Return 0 on success, an error code on failure. */
int pppClose(int pd)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 0;

	PPPDEBUG(LOG_DEBUG, ("pppClose() called\n"));

	/* Disconnect */
#if PPPOE_SUPPORT
	if (pc->ethif) {
		PPPDEBUG(LOG_DEBUG, ("pppClose: unit %d kill_link -> pppStop\n", pd));
		pc->errCode = PPPERR_USER;
		/* This will leave us at PHASE_DEAD. */
		pppStop(pd);
	} else
#endif /* PPPOE_SUPPORT */
	{
#if PPPOS_SUPPORT
		PPPDEBUG(LOG_DEBUG, ("pppClose: unit %d kill_link -> pppStop\n", pd));
		pc->errCode = PPPERR_USER;
		/* This will leave us at PHASE_DEAD. */
		pppStop(pd);
#if PPP_INPROC_OWNTHREAD
		pppRecvWakeup(pd);
#endif /* PPP_INPROC_OWNTHREAD */
#endif /* PPPOS_SUPPORT */
	}

	return st;
}

/* This function is called when carrier is lost on the PPP channel. */
void pppSigHUP(int pd)
{
	PPPDEBUG(LOG_DEBUG, ("pppSigHUP: unit %d sig_hup -> pppHupCB\n", pd));
	pppHup(pd);
}

#if PPPOS_SUPPORT
static void nPut(PPPControl *pc, struct pbuf *nb)
{
	struct pbuf *b;
	int          c;

	for (b = nb; b != NULL; b = b->next) {
		if ((c = sio_write(pc->fd, b->payload, b->len)) != b->len) {
			PPPDEBUG(LOG_WARNING,
			         ("PPP nPut: incomplete sio_write(fd:%" SZT_F ", len:%d, c: 0x%" X8_F ") c = %d\n",
			          (size_t)pc->fd,
			          b->len,
			          c,
			          c));
			LINK_STATS_INC(link.err);
			pc->lastXMit = 0; /* prepend PPP_FLAG to next packet */
			snmp_inc_ifoutdiscards(&pc->netif);
			pbuf_free(nb);
			return;
		}
	}

	snmp_add_ifoutoctets(&pc->netif, nb->tot_len);
	snmp_inc_ifoutucastpkts(&pc->netif);
	pbuf_free(nb);
	LINK_STATS_INC(link.xmit);
}

/*
 * pppAppend - append given character to end of given pbuf.  If outACCM
 * is not NULL and the character needs to be escaped, do so.
 * If pbuf is full, append another.
 * Return the current pbuf.
 */
static struct pbuf *pppAppend(u_char c, struct pbuf *nb, ext_accm *outACCM)
{
	struct pbuf *tb = nb;

	/* Make sure there is room for the character and an escape code.
	 * Sure we don't quite fill the buffer if the character doesn't
	 * get escaped but is one character worth complicating this? */
	/* Note: We assume no packet header. */
	if (nb && (PBUF_POOL_BUFSIZE - nb->len) < 2) {
		tb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
		if (tb) {
			nb->next = tb;
		} else {
			LINK_STATS_INC(link.memerr);
		}
		nb = tb;
	}

	if (nb) {
		if (outACCM && ESCAPE_P(*outACCM, c)) {
			*((u_char *)nb->payload + nb->len++) = PPP_ESCAPE;
			*((u_char *)nb->payload + nb->len++) = c ^ PPP_TRANS;
		} else {
			*((u_char *)nb->payload + nb->len++) = c;
		}
	}

	return tb;
}
#endif /* PPPOS_SUPPORT */

#if PPPOE_SUPPORT
static err_t pppifOutputOverEthernet(int pd, struct pbuf *p)
{
	PPPControl * pc = &pppControl[pd];
	struct pbuf *pb;
	u_short      protocol = PPP_IP;
	int          i        = 0;
	u16_t        tot_len;

	/* @todo: try to use pbuf_header() here! */
	pb = pbuf_alloc(PBUF_LINK, PPPOE_HDRLEN + sizeof(protocol), PBUF_RAM);
	if (!pb) {
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.proterr);
		snmp_inc_ifoutdiscards(&pc->netif);
		return ERR_MEM;
	}

	pbuf_header(pb, -(s16_t)PPPOE_HDRLEN);

	pc->lastXMit = sys_jiffies();

	if (!pc->pcomp || protocol > 0xFF) {
		*((u_char *)pb->payload + i++) = (protocol >> 8) & 0xFF;
	}
	*((u_char *)pb->payload + i) = protocol & 0xFF;

	pbuf_chain(pb, p);
	tot_len = pb->tot_len;

	if (pppoe_xmit(pc->pppoe_sc, pb) != ERR_OK) {
		LINK_STATS_INC(link.err);
		snmp_inc_ifoutdiscards(&pc->netif);
		return PPPERR_DEVICE;
	}

	snmp_add_ifoutoctets(&pc->netif, tot_len);
	snmp_inc_ifoutucastpkts(&pc->netif);
	LINK_STATS_INC(link.xmit);
	return ERR_OK;
}
#endif /* PPPOE_SUPPORT */

/* Send a packet on the given connection. */
static err_t pppifOutput(struct netif *netif, struct pbuf *pb, ip_addr_t *ipaddr)
{
	int         pd = (int)(size_t)netif->state;
	PPPControl *pc = &pppControl[pd];
#if PPPOS_SUPPORT
	u_short      protocol = PPP_IP;
	u_int        fcsOut   = PPP_INITFCS;
	struct pbuf *headMB = NULL, *tailMB = NULL, *p;
	u_char       c;
#endif /* PPPOS_SUPPORT */

	LWIP_UNUSED_ARG(ipaddr);

	/* Validate parameters. */
	/* We let any protocol value go through - it can't hurt us
	 * and the peer will just drop it if it's not accepting it. */
	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag || !pb) {
		PPPDEBUG(LOG_WARNING, ("pppifOutput[%d]: bad parms prot=%d pb=%p\n", pd, PPP_IP, pb));
		LINK_STATS_INC(link.opterr);
		LINK_STATS_INC(link.drop);
		snmp_inc_ifoutdiscards(netif);
		return ERR_ARG;
	}

	/* Check that the link is up. */
	if (lcp_phase[pd] == PHASE_DEAD) {
		PPPDEBUG(LOG_ERR, ("pppifOutput[%d]: link not up\n", pd));
		LINK_STATS_INC(link.rterr);
		LINK_STATS_INC(link.drop);
		snmp_inc_ifoutdiscards(netif);
		return ERR_RTE;
	}

#if PPPOE_SUPPORT
	if (pc->ethif) {
		return pppifOutputOverEthernet(pd, pb);
	}
#endif /* PPPOE_SUPPORT */

#if PPPOS_SUPPORT
	/* Grab an output buffer. */
	headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
	if (headMB == NULL) {
		PPPDEBUG(LOG_WARNING, ("pppifOutput[%d]: first alloc fail\n", pd));
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.drop);
		snmp_inc_ifoutdiscards(netif);
		return ERR_MEM;
	}

#if VJ_SUPPORT
	/*
	 * Attempt Van Jacobson header compression if VJ is configured and
	 * this is an IP packet.
	 */
	if (protocol == PPP_IP && pc->vjEnabled) {
		switch (vj_compress_tcp(&pc->vjComp, pb)) {
		case TYPE_IP:
			/* No change...
			   protocol = PPP_IP_PROTOCOL; */
			break;
		case TYPE_COMPRESSED_TCP:
			protocol = PPP_VJC_COMP;
			break;
		case TYPE_UNCOMPRESSED_TCP:
			protocol = PPP_VJC_UNCOMP;
			break;
		default:
			PPPDEBUG(LOG_WARNING, ("pppifOutput[%d]: bad IP packet\n", pd));
			LINK_STATS_INC(link.proterr);
			LINK_STATS_INC(link.drop);
			snmp_inc_ifoutdiscards(netif);
			pbuf_free(headMB);
			return ERR_VAL;
		}
	}
#endif /* VJ_SUPPORT */

	tailMB = headMB;

	/* Build the PPP header. */
	if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG) {
		tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
	}

	pc->lastXMit = sys_jiffies();
	if (!pc->accomp) {
		fcsOut = PPP_FCS(fcsOut, PPP_ALLSTATIONS);
		tailMB = pppAppend(PPP_ALLSTATIONS, tailMB, &pc->outACCM);
		fcsOut = PPP_FCS(fcsOut, PPP_UI);
		tailMB = pppAppend(PPP_UI, tailMB, &pc->outACCM);
	}
	if (!pc->pcomp || protocol > 0xFF) {
		c      = (protocol >> 8) & 0xFF;
		fcsOut = PPP_FCS(fcsOut, c);
		tailMB = pppAppend(c, tailMB, &pc->outACCM);
	}
	c      = protocol & 0xFF;
	fcsOut = PPP_FCS(fcsOut, c);
	tailMB = pppAppend(c, tailMB, &pc->outACCM);

	/* Load packet. */
	for (p = pb; p; p = p->next) {
		int     n;
		u_char *sPtr;

		sPtr = (u_char *)p->payload;
		n    = p->len;
		while (n-- > 0) {
			c = *sPtr++;

			/* Update FCS before checking for special characters. */
			fcsOut = PPP_FCS(fcsOut, c);

			/* Copy to output buffer escaping special characters. */
			tailMB = pppAppend(c, tailMB, &pc->outACCM);
		}
	}

	/* Add FCS and trailing flag. */
	c      = ~fcsOut & 0xFF;
	tailMB = pppAppend(c, tailMB, &pc->outACCM);
	c      = (~fcsOut >> 8) & 0xFF;
	tailMB = pppAppend(c, tailMB, &pc->outACCM);
	tailMB = pppAppend(PPP_FLAG, tailMB, NULL);

	/* If we failed to complete the packet, throw it away. */
	if (!tailMB) {
		PPPDEBUG(LOG_WARNING, ("pppifOutput[%d]: Alloc err - dropping proto=%d\n", pd, protocol));
		pbuf_free(headMB);
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.drop);
		snmp_inc_ifoutdiscards(netif);
		return ERR_MEM;
	}

	/* Send it. */
	PPPDEBUG(LOG_INFO, ("pppifOutput[%d]: proto=0x%" X16_F "\n", pd, protocol));

	nPut(pc, headMB);
#endif /* PPPOS_SUPPORT */

	return ERR_OK;
}

/* Get and set parameters for the given connection.
 * Return 0 on success, an error code on failure. */
int pppIOCtl(int pd, int cmd, void *arg)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 0;

	if (pd < 0 || pd >= NUM_PPP) {
		st = PPPERR_PARAM;
	} else {
		switch (cmd) {
		case PPPCTLG_UPSTATUS: /* Get the PPP up status. */
			if (arg) {
				*(int *)arg = (int)(pc->if_up);
			} else {
				st = PPPERR_PARAM;
			}
			break;
		case PPPCTLS_ERRCODE: /* Set the PPP error code. */
			if (arg) {
				pc->errCode = *(int *)arg;
			} else {
				st = PPPERR_PARAM;
			}
			break;
		case PPPCTLG_ERRCODE: /* Get the PPP error code. */
			if (arg) {
				*(int *)arg = (int)(pc->errCode);
			} else {
				st = PPPERR_PARAM;
			}
			break;
#if PPPOS_SUPPORT
		case PPPCTLG_FD: /* Get the fd associated with the ppp */
			if (arg) {
				*(sio_fd_t *)arg = pc->fd;
			} else {
				st = PPPERR_PARAM;
			}
			break;
#endif /* PPPOS_SUPPORT */
		default:
			st = PPPERR_PARAM;
			break;
		}
	}

	return st;
}

/*
 * Return the Maximum Transmission Unit for the given PPP connection.
 */
u_short pppMTU(int pd)
{
	PPPControl *pc = &pppControl[pd];
	u_short     st;

	/* Validate parameters. */
	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
	} else {
		st = pc->mtu;
	}

	return st;
}

#if PPPOE_SUPPORT
int pppWriteOverEthernet(int pd, const u_char *s, int n)
{
	PPPControl * pc = &pppControl[pd];
	struct pbuf *pb;

	/* skip address & flags */
	s += 2;
	n -= 2;

	LWIP_ASSERT("PPPOE_HDRLEN + n <= 0xffff", PPPOE_HDRLEN + n <= 0xffff);
	pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HDRLEN + n), PBUF_RAM);
	if (!pb) {
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.proterr);
		snmp_inc_ifoutdiscards(&pc->netif);
		return PPPERR_ALLOC;
	}

	pbuf_header(pb, -(s16_t)PPPOE_HDRLEN);

	pc->lastXMit = sys_jiffies();

	MEMCPY(pb->payload, s, n);

	if (pppoe_xmit(pc->pppoe_sc, pb) != ERR_OK) {
		LINK_STATS_INC(link.err);
		snmp_inc_ifoutdiscards(&pc->netif);
		return PPPERR_DEVICE;
	}

	snmp_add_ifoutoctets(&pc->netif, (u16_t)n);
	snmp_inc_ifoutucastpkts(&pc->netif);
	LINK_STATS_INC(link.xmit);
	return PPPERR_NONE;
}
#endif /* PPPOE_SUPPORT */

/*
 * Write n characters to a ppp link.
 *  RETURN: >= 0 Number of characters written
 *           -1 Failed to write to device
 */
int pppWrite(int pd, const u_char *s, int n)
{
	PPPControl *pc = &pppControl[pd];
#if PPPOS_SUPPORT
	u_char       c;
	u_int        fcsOut;
	struct pbuf *headMB, *tailMB;
#endif /* PPPOS_SUPPORT */

#if PPPOE_SUPPORT
	if (pc->ethif) {
		return pppWriteOverEthernet(pd, s, n);
	}
#endif /* PPPOE_SUPPORT */

#if PPPOS_SUPPORT
	headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
	if (headMB == NULL) {
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.proterr);
		snmp_inc_ifoutdiscards(&pc->netif);
		return PPPERR_ALLOC;
	}

	tailMB = headMB;

	/* If the link has been idle, we'll send a fresh flag character to
	 * flush any noise. */
	if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG) {
		tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
	}
	pc->lastXMit = sys_jiffies();

	fcsOut = PPP_INITFCS;
	/* Load output buffer. */
	while (n-- > 0) {
		c = *s++;

		/* Update FCS before checking for special characters. */
		fcsOut = PPP_FCS(fcsOut, c);

		/* Copy to output buffer escaping special characters. */
		tailMB = pppAppend(c, tailMB, &pc->outACCM);
	}

	/* Add FCS and trailing flag. */
	c      = ~fcsOut & 0xFF;
	tailMB = pppAppend(c, tailMB, &pc->outACCM);
	c      = (~fcsOut >> 8) & 0xFF;
	tailMB = pppAppend(c, tailMB, &pc->outACCM);
	tailMB = pppAppend(PPP_FLAG, tailMB, NULL);

	/* If we failed to complete the packet, throw it away.
	 * Otherwise send it. */
	if (!tailMB) {
		PPPDEBUG(LOG_WARNING, ("pppWrite[%d]: Alloc err - dropping pbuf len=%d\n", pd, headMB->len));
		/*"pppWrite[%d]: Alloc err - dropping %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40),
		 * headMB->payload)); */
		pbuf_free(headMB);
		LINK_STATS_INC(link.memerr);
		LINK_STATS_INC(link.proterr);
		snmp_inc_ifoutdiscards(&pc->netif);
		return PPPERR_ALLOC;
	}

	PPPDEBUG(LOG_INFO, ("pppWrite[%d]: len=%d\n", pd, headMB->len));
	/* "pppWrite[%d]: %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40), headMB->payload)); */
	nPut(pc, headMB);
#endif /* PPPOS_SUPPORT */

	return PPPERR_NONE;
}

/*
 * ppp_send_config - configure the transmit characteristics of
 * the ppp interface.
 */
void ppp_send_config(int unit, u16_t mtu, u32_t asyncmap, int pcomp, int accomp)
{
	PPPControl *pc = &pppControl[unit];
	int         i;

	pc->mtu    = mtu;
	pc->pcomp  = pcomp;
	pc->accomp = accomp;

	/* Load the ACCM bits for the 32 control codes. */
	for (i = 0; i < 32 / 8; i++) {
		pc->outACCM[i] = (u_char)((asyncmap >> (8 * i)) & 0xFF);
	}
	PPPDEBUG(LOG_INFO,
	         ("ppp_send_config[%d]: outACCM=%X %X %X %X\n",
	          unit,
	          pc->outACCM[0],
	          pc->outACCM[1],
	          pc->outACCM[2],
	          pc->outACCM[3]));
}

/*
 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 */
void ppp_set_xaccm(int unit, ext_accm *accm)
{
	SMEMCPY(pppControl[unit].outACCM, accm, sizeof(ext_accm));
	PPPDEBUG(LOG_INFO,
	         ("ppp_set_xaccm[%d]: outACCM=%X %X %X %X\n",
	          unit,
	          pppControl[unit].outACCM[0],
	          pppControl[unit].outACCM[1],
	          pppControl[unit].outACCM[2],
	          pppControl[unit].outACCM[3]));
}

/*
 * ppp_recv_config - configure the receive-side characteristics of
 * the ppp interface.
 */
void ppp_recv_config(int unit, int mru, u32_t asyncmap, int pcomp, int accomp)
{
	PPPControl *pc = &pppControl[unit];
	int         i;
	SYS_ARCH_DECL_PROTECT(lev);

	LWIP_UNUSED_ARG(accomp);
	LWIP_UNUSED_ARG(pcomp);
	LWIP_UNUSED_ARG(mru);

	/* Load the ACCM bits for the 32 control codes. */
	SYS_ARCH_PROTECT(lev);
	for (i = 0; i < 32 / 8; i++) {
		/* @todo: does this work? ext_accm has been modified from pppd! */
		pc->rx.inACCM[i] = (u_char)(asyncmap >> (i * 8));
	}
	SYS_ARCH_UNPROTECT(lev);
	PPPDEBUG(LOG_INFO,
	         ("ppp_recv_config[%d]: inACCM=%X %X %X %X\n",
	          unit,
	          pc->rx.inACCM[0],
	          pc->rx.inACCM[1],
	          pc->rx.inACCM[2],
	          pc->rx.inACCM[3]));
}

#if 0
/*
 * ccp_test - ask kernel whether a given compression method
 * is acceptable for use.  Returns 1 if the method and parameters
 * are OK, 0 if the method is known but the parameters are not OK
 * (e.g. code size should be reduced), or -1 if the method is unknown.
 */
int
ccp_test( int unit, int opt_len,  int for_transmit, u_char *opt_ptr)
{
  return 0; /* XXX Currently no compression. */
}

/*
 * ccp_flags_set - inform kernel about the current state of CCP.
 */
void
ccp_flags_set(int unit, int isopen, int isup)
{
  /* XXX */
}

/*
 * ccp_fatal_error - returns 1 if decompression was disabled as a
 * result of an error detected after decompression of a packet,
 * 0 otherwise.  This is necessary because of patent nonsense.
 */
int
ccp_fatal_error(int unit)
{
  /* XXX */
  return 0;
}
#endif

/*
 * get_idle_time - return how long the link has been idle.
 */
int get_idle_time(int u, struct ppp_idle *ip)
{
	/* XXX */
	LWIP_UNUSED_ARG(u);
	LWIP_UNUSED_ARG(ip);

	return 0;
}

/*
 * Return user specified netmask, modified by any mask we might determine
 * for address `addr' (in network byte order).
 * Here we scan through the system's list of interfaces, looking for
 * any non-point-to-point interfaces which might appear to be on the same
 * network as `addr'.  If we find any, we OR in their netmask to the
 * user-specified netmask.
 */
u32_t GetMask(u32_t addr)
{
	u32_t mask, nmask;

	addr = htonl(addr);
	if (IP_CLASSA(addr)) { /* determine network mask for address class */
		nmask = IP_CLASSA_NET;
	} else if (IP_CLASSB(addr)) {
		nmask = IP_CLASSB_NET;
	} else {
		nmask = IP_CLASSC_NET;
	}

	/* class D nets are disallowed by bad_ip_adrs */
	mask = subnetMask | htonl(nmask);

	/* XXX
	 * Scan through the system's network interfaces.
	 * Get each netmask and OR them into our mask.
	 */

	return mask;
}

/*
 * sifvjcomp - config tcp header compression
 */
int sifvjcomp(int pd, int vjcomp, u8_t cidcomp, u8_t maxcid)
{
#if PPPOS_SUPPORT && VJ_SUPPORT
	PPPControl *pc = &pppControl[pd];

	pc->vjEnabled           = vjcomp;
	pc->vjComp.compressSlot = cidcomp;
	pc->vjComp.maxSlotIndex = maxcid;
	PPPDEBUG(LOG_INFO, ("sifvjcomp: VJ compress enable=%d slot=%d max slot=%d\n", vjcomp, cidcomp, maxcid));
#else  /* PPPOS_SUPPORT && VJ_SUPPORT */
	LWIP_UNUSED_ARG(pd);
	LWIP_UNUSED_ARG(vjcomp);
	LWIP_UNUSED_ARG(cidcomp);
	LWIP_UNUSED_ARG(maxcid);
#endif /* PPPOS_SUPPORT && VJ_SUPPORT */

	return 0;
}

/*
 * pppifNetifInit - netif init callback
 */
static err_t pppifNetifInit(struct netif *netif)
{
	netif->name[0] = 'p';
	netif->name[1] = 'p';
	netif->output  = pppifOutput;
	netif->mtu     = pppMTU((int)(size_t)netif->state);
	netif->flags   = NETIF_FLAG_POINTTOPOINT | NETIF_FLAG_LINK_UP;
#if LWIP_NETIF_HOSTNAME
	/* @todo: Initialize interface hostname */
	/* netif_set_hostname(netif, "lwip"); */
#endif /* LWIP_NETIF_HOSTNAME */
	return ERR_OK;
}

/*
 * sifup - Config the interface up and enable IP packets to pass.
 */
int sifup(int pd)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifup[%d]: bad parms\n", pd));
	} else {
		netif_remove(&pc->netif);
		if (netif_add(&pc->netif,
		              &pc->addrs.our_ipaddr,
		              &pc->addrs.netmask,
		              &pc->addrs.his_ipaddr,
		              (void *)(size_t)pd,
		              pppifNetifInit,
		              ip_input)) {
			netif_set_up(&pc->netif);
			pc->if_up   = 1;
			pc->errCode = PPPERR_NONE;

			PPPDEBUG(LOG_DEBUG, ("sifup: unit %d: linkStatusCB=%p errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
			if (pc->linkStatusCB) {
				pc->linkStatusCB(pc->linkStatusCtx, pc->errCode, &pc->addrs);
			}
		} else {
			st = 0;
			PPPDEBUG(LOG_ERR, ("sifup[%d]: netif_add failed\n", pd));
		}
	}

	return st;
}

/*
 * sifnpmode - Set the mode for handling packets for a given NP.
 */
int sifnpmode(int u, int proto, enum NPmode mode)
{
	LWIP_UNUSED_ARG(u);
	LWIP_UNUSED_ARG(proto);
	LWIP_UNUSED_ARG(mode);
	return 0;
}

/*
 * sifdown - Config the interface down and disable IP.
 */
int sifdown(int pd)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifdown[%d]: bad parms\n", pd));
	} else {
		pc->if_up = 0;
		/* make sure the netif status callback is called */
		netif_set_down(&pc->netif);
		netif_remove(&pc->netif);
		PPPDEBUG(LOG_DEBUG, ("sifdown: unit %d: linkStatusCB=%p errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
		if (pc->linkStatusCB) {
			pc->linkStatusCB(pc->linkStatusCtx, PPPERR_CONNECT, NULL);
		}
	}
	return st;
}

/**
 * sifaddr - Config the interface IP addresses and netmask.
 * @param pd Interface unit ???
 * @param o Our IP address ???
 * @param h His IP address ???
 * @param m IP subnet mask ???
 * @param ns1 Primary DNS
 * @param ns2 Secondary DNS
 */
int sifaddr(int pd, u32_t o, u32_t h, u32_t m, u32_t ns1, u32_t ns2)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifup[%d]: bad parms\n", pd));
	} else {
		SMEMCPY(&pc->addrs.our_ipaddr, &o, sizeof(o));
		SMEMCPY(&pc->addrs.his_ipaddr, &h, sizeof(h));
		SMEMCPY(&pc->addrs.netmask, &m, sizeof(m));
		SMEMCPY(&pc->addrs.dns1, &ns1, sizeof(ns1));
		SMEMCPY(&pc->addrs.dns2, &ns2, sizeof(ns2));
	}
	return st;
}

/**
 * cifaddr - Clear the interface IP addresses, and delete routes
 * through the interface if possible.
 * @param pd Interface unit ???
 * @param o Our IP address ???
 * @param h IP broadcast address ???
 */
int cifaddr(int pd, u32_t o, u32_t h)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	LWIP_UNUSED_ARG(o);
	LWIP_UNUSED_ARG(h);
	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifup[%d]: bad parms\n", pd));
	} else {
		IP4_ADDR(&pc->addrs.our_ipaddr, 0, 0, 0, 0);
		IP4_ADDR(&pc->addrs.his_ipaddr, 0, 0, 0, 0);
		IP4_ADDR(&pc->addrs.netmask, 255, 255, 255, 0);
		IP4_ADDR(&pc->addrs.dns1, 0, 0, 0, 0);
		IP4_ADDR(&pc->addrs.dns2, 0, 0, 0, 0);
	}
	return st;
}

/*
 * sifdefaultroute - assign a default route through the address given.
 */
int sifdefaultroute(int pd, u32_t l, u32_t g)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	LWIP_UNUSED_ARG(l);
	LWIP_UNUSED_ARG(g);

	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifup[%d]: bad parms\n", pd));
	} else {
		netif_set_default(&pc->netif);
	}

	/* TODO: check how PPP handled the netMask, previously not set by ipSetDefault */

	return st;
}

/*
 * cifdefaultroute - delete a default route through the address given.
 */
int cifdefaultroute(int pd, u32_t l, u32_t g)
{
	PPPControl *pc = &pppControl[pd];
	int         st = 1;

	LWIP_UNUSED_ARG(l);
	LWIP_UNUSED_ARG(g);

	if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
		st = 0;
		PPPDEBUG(LOG_WARNING, ("sifup[%d]: bad parms\n", pd));
	} else {
		netif_set_default(NULL);
	}

	return st;
}

	/**********************************/
	/*** LOCAL FUNCTION DEFINITIONS ***/
	/**********************************/

#if PPPOS_SUPPORT && PPP_INPROC_OWNTHREAD
/* The main PPP process function.  This implements the state machine according
 * to section 4 of RFC 1661: The Point-To-Point Protocol. */
static void pppInputThread(void *arg)
{
	int           count;
	PPPControlRx *pcrx = arg;

	while (lcp_phase[pcrx->pd] != PHASE_DEAD) {
		count = sio_read(pcrx->fd, pcrx->rxbuf, PPPOS_RX_BUFSIZE);
		if (count > 0) {
			pppInProc(pcrx, pcrx->rxbuf, count);
		} else {
			/* nothing received, give other tasks a chance to run */
			sys_msleep(1);
		}
	}
}
#endif /* PPPOS_SUPPORT && PPP_INPROC_OWNTHREAD */

#if PPPOE_SUPPORT

void pppOverEthernetInitFailed(int pd)
{
	PPPControl *pc;

	pppHup(pd);
	pppStop(pd);

	pc = &pppControl[pd];
	pppoe_destroy(&pc->netif);
	pc->openFlag = 0;

	if (pc->linkStatusCB) {
		pc->linkStatusCB(pc->linkStatusCtx, pc->errCode ? pc->errCode : PPPERR_PROTOCOL, NULL);
	}
}

static void pppOverEthernetLinkStatusCB(int pd, int up)
{
	if (up) {
		PPPDEBUG(LOG_INFO, ("pppOverEthernetLinkStatusCB: unit %d: Connecting\n", pd));
		pppStart(pd);
	} else {
		pppOverEthernetInitFailed(pd);
	}
}
#endif /* PPPOE_SUPPORT */

struct pbuf *pppSingleBuf(struct pbuf *p)
{
	struct pbuf *q, *b;
	u_char *     pl;

	if (p->tot_len == p->len) {
		return p;
	}

	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
	if (!q) {
		PPPDEBUG(LOG_ERR, ("pppSingleBuf: unable to alloc new buf (%d)\n", p->tot_len));
		return p; /* live dangerously */
	}

	for (b = p, pl = q->payload; b != NULL; b = b->next) {
		MEMCPY(pl, b->payload, b->len);
		pl += b->len;
	}

	pbuf_free(p);

	return q;
}

struct pppInputHeader {
	int   unit;
	u16_t proto;
};

/*
 * Pass the processed input packet to the appropriate handler.
 * This function and all handlers run in the context of the tcpip_thread
 */
static void pppInput(void *arg)
{
	struct pbuf *nb = (struct pbuf *)arg;
	u16_t        protocol;
	int          pd;

	pd       = ((struct pppInputHeader *)nb->payload)->unit;
	protocol = ((struct pppInputHeader *)nb->payload)->proto;

	if (pbuf_header(nb, -(int)sizeof(struct pppInputHeader))) {
		LWIP_ASSERT("pbuf_header failed\n", 0);
		goto drop;
	}

	LINK_STATS_INC(link.recv);
	snmp_inc_ifinucastpkts(&pppControl[pd].netif);
	snmp_add_ifinoctets(&pppControl[pd].netif, nb->tot_len);

	/*
	 * Toss all non-LCP packets unless LCP is OPEN.
	 * Until we get past the authentication phase, toss all packets
	 * except LCP, LQR and authentication packets.
	 */
	if ((lcp_phase[pd] <= PHASE_AUTHENTICATE) && (protocol != PPP_LCP)) {
		if (!((protocol == PPP_LQR) || (protocol == PPP_PAP) || (protocol == PPP_CHAP))
		    || (lcp_phase[pd] != PHASE_AUTHENTICATE)) {
			PPPDEBUG(LOG_INFO, ("pppInput: discarding proto 0x%" X16_F " in phase %d\n", protocol, lcp_phase[pd]));
			goto drop;
		}
	}

	switch (protocol) {
	case PPP_VJC_COMP: /* VJ compressed TCP */
#if PPPOS_SUPPORT && VJ_SUPPORT
		PPPDEBUG(LOG_INFO, ("pppInput[%d]: vj_comp in pbuf len=%d\n", pd, nb->len));
		/*
		 * Clip off the VJ header and prepend the rebuilt TCP/IP header and
		 * pass the result to IP.
		 */
		if ((vj_uncompress_tcp(&nb, &pppControl[pd].vjComp) >= 0) && (pppControl[pd].netif.input)) {
			pppControl[pd].netif.input(nb, &pppControl[pd].netif);
			return;
		}
		/* Something's wrong so drop it. */
		PPPDEBUG(LOG_WARNING, ("pppInput[%d]: Dropping VJ compressed\n", pd));
#else  /* PPPOS_SUPPORT && VJ_SUPPORT */
		/* No handler for this protocol so drop the packet. */
		PPPDEBUG(LOG_INFO, ("pppInput[%d]: drop VJ Comp in %d:%s\n", pd, nb->len, nb->payload));
#endif /* PPPOS_SUPPORT && VJ_SUPPORT */
		break;

	case PPP_VJC_UNCOMP: /* VJ uncompressed TCP */
#if PPPOS_SUPPORT && VJ_SUPPORT
		PPPDEBUG(LOG_INFO, ("pppInput[%d]: vj_un in pbuf len=%d\n", pd, nb->len));
		/*
		 * Process the TCP/IP header for VJ header compression and then pass
		 * the packet to IP.
		 */
		if ((vj_uncompress_uncomp(nb, &pppControl[pd].vjComp) >= 0) && pppControl[pd].netif.input) {
			pppControl[pd].netif.input(nb, &pppControl[pd].netif);
			return;
		}
		/* Something's wrong so drop it. */
		PPPDEBUG(LOG_WARNING, ("pppInput[%d]: Dropping VJ uncompressed\n", pd));
#else  /* PPPOS_SUPPORT && VJ_SUPPORT */
		/* No handler for this protocol so drop the packet. */
		PPPDEBUG(LOG_INFO,
		         ("pppInput[%d]: drop VJ UnComp in %d:.*H\n", pd, nb->len, LWIP_MIN(nb->len * 2, 40), nb->payload));
#endif /* PPPOS_SUPPORT && VJ_SUPPORT */
		break;

	case PPP_IP: /* Internet Protocol */
		PPPDEBUG(LOG_INFO, ("pppInput[%d]: ip in pbuf len=%d\n", pd, nb->len));
		if (pppControl[pd].netif.input) {
			pppControl[pd].netif.input(nb, &pppControl[pd].netif);
			return;
		}
		break;

	default: {
		struct protent *protp;
		int             i;

		/*
		 * Upcall the proper protocol input routine.
		 */
		for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
			if (protp->protocol == protocol && protp->enabled_flag) {
				PPPDEBUG(LOG_INFO, ("pppInput[%d]: %s len=%d\n", pd, protp->name, nb->len));
				nb = pppSingleBuf(nb);
				(*protp->input)(pd, nb->payload, nb->len);
				PPPDEBUG(LOG_DETAIL, ("pppInput[%d]: packet processed\n", pd));
				goto out;
			}
		}

		/* No handler for this protocol so reject the packet. */
		PPPDEBUG(LOG_INFO, ("pppInput[%d]: rejecting unsupported proto 0x%" X16_F " len=%d\n", pd, protocol, nb->len));
		if (pbuf_header(nb, sizeof(protocol))) {
			LWIP_ASSERT("pbuf_header failed\n", 0);
			goto drop;
		}
#if BYTE_ORDER == LITTLE_ENDIAN
		protocol = htons(protocol);
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
		SMEMCPY(nb->payload, &protocol, sizeof(protocol));
		lcp_sprotrej(pd, nb->payload, nb->len);
	} break;
	}

drop:
	LINK_STATS_INC(link.drop);
	snmp_inc_ifindiscards(&pppControl[pd].netif);

out:
	pbuf_free(nb);
	return;
}

#if PPPOS_SUPPORT
/*
 * Drop the input packet.
 */
static void pppFreeCurrentInputPacket(PPPControlRx *pcrx)
{
	if (pcrx->inHead != NULL) {
		if (pcrx->inTail && (pcrx->inTail != pcrx->inHead)) {
			pbuf_free(pcrx->inTail);
		}
		pbuf_free(pcrx->inHead);
		pcrx->inHead = NULL;
	}
	pcrx->inTail = NULL;
}

/*
 * Drop the input packet and increase error counters.
 */
static void pppDrop(PPPControlRx *pcrx)
{
	if (pcrx->inHead != NULL) {
#if 0
    PPPDEBUG(LOG_INFO, ("pppDrop: %d:%.*H\n", pcrx->inHead->len, min(60, pcrx->inHead->len * 2), pcrx->inHead->payload));
#endif
		PPPDEBUG(LOG_INFO, ("pppDrop: pbuf len=%d, addr %p\n", pcrx->inHead->len, (void *)pcrx->inHead));
	}
	pppFreeCurrentInputPacket(pcrx);
#if VJ_SUPPORT
	vj_uncompress_err(&pppControl[pcrx->pd].vjComp);
#endif /* VJ_SUPPORT */

	LINK_STATS_INC(link.drop);
	snmp_inc_ifindiscards(&pppControl[pcrx->pd].netif);
}

#if !PPP_INPROC_OWNTHREAD
/** Pass received raw characters to PPPoS to be decoded. This function is
 * thread-safe and can be called from a dedicated RX-thread or from a main-loop.
 *
 * @param pd PPP descriptor index, returned by pppOpen()
 * @param data received data
 * @param len length of received data
 */
void pppos_input(int pd, u_char *data, int len)
{
	pppInProc(&pppControl[pd].rx, data, len);
}
#endif

/**
 * Process a received octet string.
 */
static void pppInProc(PPPControlRx *pcrx, u_char *s, int l)
{
	struct pbuf *nextNBuf;
	u_char       curChar;
	u_char       escaped;
	SYS_ARCH_DECL_PROTECT(lev);

	PPPDEBUG(LOG_DEBUG, ("pppInProc[%d]: got %d bytes\n", pcrx->pd, l));
	while (l-- > 0) {
		curChar = *s++;

		SYS_ARCH_PROTECT(lev);
		escaped = ESCAPE_P(pcrx->inACCM, curChar);
		SYS_ARCH_UNPROTECT(lev);
		/* Handle special characters. */
		if (escaped) {
			/* Check for escape sequences. */
			/* XXX Note that this does not handle an escaped 0x5d character which
			 * would appear as an escape character.  Since this is an ASCII ']'
			 * and there is no reason that I know of to escape it, I won't complicate
			 * the code to handle this case. GLL */
			if (curChar == PPP_ESCAPE) {
				pcrx->inEscaped = 1;
				/* Check for the flag character. */
			} else if (curChar == PPP_FLAG) {
				/* If this is just an extra flag character, ignore it. */
				if (pcrx->inState <= PDADDRESS) {
					/* ignore it */;
					/* If we haven't received the packet header, drop what has come in. */
				} else if (pcrx->inState < PDDATA) {
					PPPDEBUG(LOG_WARNING, ("pppInProc[%d]: Dropping incomplete packet %d\n", pcrx->pd, pcrx->inState));
					LINK_STATS_INC(link.lenerr);
					pppDrop(pcrx);
					/* If the fcs is invalid, drop the packet. */
				} else if (pcrx->inFCS != PPP_GOODFCS) {
					PPPDEBUG(LOG_INFO,
					         ("pppInProc[%d]: Dropping bad fcs 0x%" X16_F " proto=0x%" X16_F "\n",
					          pcrx->pd,
					          pcrx->inFCS,
					          pcrx->inProtocol));
					/* Note: If you get lots of these, check for UART frame errors or try different baud rate */
					LINK_STATS_INC(link.chkerr);
					pppDrop(pcrx);
					/* Otherwise it's a good packet so pass it on. */
				} else {
					struct pbuf *inp;
					/* Trim off the checksum. */
					if (pcrx->inTail->len >= 2) {
						pcrx->inTail->len -= 2;

						pcrx->inTail->tot_len = pcrx->inTail->len;
						if (pcrx->inTail != pcrx->inHead) {
							pbuf_cat(pcrx->inHead, pcrx->inTail);
						}
					} else {
						pcrx->inTail->tot_len = pcrx->inTail->len;
						if (pcrx->inTail != pcrx->inHead) {
							pbuf_cat(pcrx->inHead, pcrx->inTail);
						}

						pbuf_realloc(pcrx->inHead, pcrx->inHead->tot_len - 2);
					}

					/* Dispatch the packet thereby consuming it. */
					inp = pcrx->inHead;
					/* Packet consumed, release our references. */
					pcrx->inHead = NULL;
					pcrx->inTail = NULL;
#if PPP_INPROC_MULTITHREADED
					if (tcpip_callback_with_block(pppInput, inp, 0) != ERR_OK) {
						PPPDEBUG(LOG_ERR, ("pppInProc[%d]: tcpip_callback() failed, dropping packet\n", pcrx->pd));
						pbuf_free(inp);
						LINK_STATS_INC(link.drop);
						snmp_inc_ifindiscards(&pppControl[pcrx->pd].netif);
					}
#else  /* PPP_INPROC_MULTITHREADED */
					pppInput(inp);
#endif /* PPP_INPROC_MULTITHREADED */
				}

				/* Prepare for a new packet. */
				pcrx->inFCS     = PPP_INITFCS;
				pcrx->inState   = PDADDRESS;
				pcrx->inEscaped = 0;
				/* Other characters are usually control characters that may have
				 * been inserted by the physical layer so here we just drop them. */
			} else {
				PPPDEBUG(LOG_WARNING, ("pppInProc[%d]: Dropping ACCM char <%d>\n", pcrx->pd, curChar));
			}
			/* Process other characters. */
		} else {
			/* Unencode escaped characters. */
			if (pcrx->inEscaped) {
				pcrx->inEscaped = 0;
				curChar ^= PPP_TRANS;
			}

			/* Process character relative to current state. */
			switch (pcrx->inState) {
			case PDIDLE: /* Idle state - waiting. */
				/* Drop the character if it's not 0xff
				 * we would have processed a flag character above. */
				if (curChar != PPP_ALLSTATIONS) {
					break;
				}

			/* Fall through */
			case PDSTART: /* Process start flag. */
				/* Prepare for a new packet. */
				pcrx->inFCS = PPP_INITFCS;

			/* Fall through */
			case PDADDRESS: /* Process address field. */
				if (curChar == PPP_ALLSTATIONS) {
					pcrx->inState = PDCONTROL;
					break;
				}
				/* Else assume compressed address and control fields so
				 * fall through to get the protocol... */
			case PDCONTROL: /* Process control field. */
				/* If we don't get a valid control code, restart. */
				if (curChar == PPP_UI) {
					pcrx->inState = PDPROTOCOL1;
					break;
				}
#if 0
          else {
            PPPDEBUG(LOG_WARNING,
                     ("pppInProc[%d]: Invalid control <%d>\n", pcrx->pd, curChar));
            pcrx->inState = PDSTART;
          }
#endif
			case PDPROTOCOL1: /* Process protocol field 1. */
				/* If the lower bit is set, this is the end of the protocol
				 * field. */
				if (curChar & 1) {
					pcrx->inProtocol = curChar;
					pcrx->inState    = PDDATA;
				} else {
					pcrx->inProtocol = (u_int)curChar << 8;
					pcrx->inState    = PDPROTOCOL2;
				}
				break;
			case PDPROTOCOL2: /* Process protocol field 2. */
				pcrx->inProtocol |= curChar;
				pcrx->inState = PDDATA;
				break;
			case PDDATA: /* Process data byte. */
				/* Make space to receive processed data. */
				if (pcrx->inTail == NULL || pcrx->inTail->len == PBUF_POOL_BUFSIZE) {
					if (pcrx->inTail != NULL) {
						pcrx->inTail->tot_len = pcrx->inTail->len;
						if (pcrx->inTail != pcrx->inHead) {
							pbuf_cat(pcrx->inHead, pcrx->inTail);
							/* give up the inTail reference now */
							pcrx->inTail = NULL;
						}
					}
					/* If we haven't started a packet, we need a packet header. */
					nextNBuf = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
					if (nextNBuf == NULL) {
						/* No free buffers.  Drop the input packet and let the
						 * higher layers deal with it.  Continue processing
						 * the received pbuf chain in case a new packet starts. */
						PPPDEBUG(LOG_ERR, ("pppInProc[%d]: NO FREE MBUFS!\n", pcrx->pd));
						LINK_STATS_INC(link.memerr);
						pppDrop(pcrx);
						pcrx->inState = PDSTART; /* Wait for flag sequence. */
						break;
					}
					if (pcrx->inHead == NULL) {
						struct pppInputHeader *pih = nextNBuf->payload;

						pih->unit  = pcrx->pd;
						pih->proto = pcrx->inProtocol;

						nextNBuf->len += sizeof(*pih);

						pcrx->inHead = nextNBuf;
					}
					pcrx->inTail = nextNBuf;
				}
				/* Load character into buffer. */
				((u_char *)pcrx->inTail->payload)[pcrx->inTail->len++] = curChar;
				break;
			}

			/* update the frame check sequence number. */
			pcrx->inFCS = PPP_FCS(pcrx->inFCS, curChar);
		}
	} /* while (l-- > 0), all bytes processed */

	avRandomize();
}
#endif /* PPPOS_SUPPORT */

#if PPPOE_SUPPORT
void pppInProcOverEthernet(int pd, struct pbuf *pb)
{
	struct pppInputHeader *pih;
	u16_t                  inProtocol;

	if (pb->len < sizeof(inProtocol)) {
		PPPDEBUG(LOG_ERR, ("pppInProcOverEthernet: too small for protocol field\n"));
		goto drop;
	}

	inProtocol = (((u8_t *)pb->payload)[0] << 8) | ((u8_t *)pb->payload)[1];

	/* make room for pppInputHeader - should not fail */
	if (pbuf_header(pb, sizeof(*pih) - sizeof(inProtocol)) != 0) {
		PPPDEBUG(LOG_ERR, ("pppInProcOverEthernet: could not allocate room for header\n"));
		goto drop;
	}

	pih = pb->payload;

	pih->unit  = pd;
	pih->proto = inProtocol;

	/* Dispatch the packet thereby consuming it. */
	pppInput(pb);
	return;

drop:
	LINK_STATS_INC(link.drop);
	snmp_inc_ifindiscards(&pppControl[pd].netif);
	pbuf_free(pb);
	return;
}
#endif /* PPPOE_SUPPORT */

#if LWIP_NETIF_STATUS_CALLBACK
/** Set the status callback of a PPP's netif
 *
 * @param pd The PPP descriptor returned by pppOpen()
 * @param status_callback pointer to the status callback function
 *
 * @see netif_set_status_callback
 */
void ppp_set_netif_statuscallback(int pd, netif_status_callback_fn status_callback)
{
	netif_set_status_callback(&pppControl[pd].netif, status_callback);
}
#endif /* LWIP_NETIF_STATUS_CALLBACK */

#if LWIP_NETIF_LINK_CALLBACK
/** Set the link callback of a PPP's netif
 *
 * @param pd The PPP descriptor returned by pppOpen()
 * @param link_callback pointer to the link callback function
 *
 * @see netif_set_link_callback
 */
void ppp_set_netif_linkcallback(int pd, netif_status_callback_fn link_callback)
{
	netif_set_link_callback(&pppControl[pd].netif, link_callback);
}
#endif /* LWIP_NETIF_LINK_CALLBACK */

#endif /* PPP_SUPPORT */
